Will mankind on earth reattain the original state of Adam and Eve?

> Adam and Eve, were constituted in an original "state of holiness and > justice".250 This grace of original holiness was "to share in. . > .divine life" CCC375 Now, I've heard a priest say that through Christ's death on the cross all of humanity will go back to the original state. I imagine this as if mankind's goal was to return back to Adam's original state of holiness. And when looking at history, we can see that societies are becoming softer and more authentic despite all the evil happening around us. Thanks to new technologies, humans are more open and transparent, which changes our mentality. My question is: Will this happen on Earth, or is it meant for after the Second Coming and Resurrection? What Catholic teaching is the priest referring to?